RCC Structures Design
The length of lap in tension reinforcement should not be less than the bar diameter × (actual tension / four times the permissible average bond stress) if it is more than

36 bar diameters
24 bar diameters
30 bar diameters
18 bar diameters

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RCC Structures Design
Based on punching shear consideration, the overall depth of a combined footing under a column A, is

(Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
(Area of the column A × Safe punching stress)/Load on column A
(Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
None of these

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RCC Structures Design
For a ribbed slab

Clear spacing between ribs shall not be greater than 4.5 cm
Overall depth of the slab shall not exceed four times the breadth of the rib
All listed here
Width of the rib shall not be less than 7.5 cm

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